/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--white);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition-header);
}

/* Container du header */
.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo-wrapper {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 10px 0;
    transition: var(--transition-header);
}

.logo {
    height: 100%;
    width: auto;
    object-fit: contain;
    transition: var(--transition-header);
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.nav a {
    color: var(--text-color);
    font-weight: 600;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav a:hover,
.nav a.active {
    color: var(--primary-color);
    background: var(--gradient-bg);
}

/* Burger Menu */
.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
}

.burger-menu span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* Style du menu burger actif */
.burger-menu.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.burger-menu.active span:nth-child(2) {
    opacity: 0;
}

.burger-menu.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Media Queries */
@media (max-width: 768px) {
    /* Afficher le burger menu */
    .burger-menu {
        display: flex;
        z-index: 1001;
    }

    /* Adapter la navigation en mobile */
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: var(--space-md) 0;
        transform: translateX(100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease-in-out;
    }

    .nav.active {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
        box-shadow: var(--shadow);
    }

    .nav a {
        width: 100%;
        text-align: center;
        padding: var(--space-sm) var(--space-md);
    }

    .nav a:hover {
        background: var(--gradient-bg);
    }

    /* Ajuster le logo en mobile */
    .logo-wrapper {
        padding: 5px 0;
    }

    .logo {
        height: 40px;
    }
}

/* Effets de scroll */
.header.scrolled {
    box-shadow: var(--shadow-lg);
    height: var(--header-height-scrolled);
}

.header.scrolled .logo-wrapper {
    padding: 5px 0;
}

.header.scrolled .logo {
    height: 55px; /* Logo plus grand lors du scroll */
}

/* Adaptation mobile pour le header scrolled */
@media (max-width: 768px) {
    .header.scrolled .logo {
        height: 40px; /* Logo plus petit en mobile mais toujours suffisamment visible */
    }

    .header.scrolled .nav {
        top: var(--header-height-scrolled);
    }
}

/* Support des préférences de réduction de mouvement */
@media (prefers-reduced-motion: reduce) {
    .header,
    .nav,
    .burger-menu span,
    .logo {
        transition: none;
    }
}

/* État de focus pour l'accessibilité */
.burger-menu:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.nav a:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--primary-color);
}